| 摘要 |
Electromagnets are placed to face each other in a yoke. Both ends of pole cores of the electromagnets are extended and bent. Permanent magnets are sandwiched between the extended parts of the pole cores. The north pole and south pole of the permanent magnet are in abutment with the north pole core and south pole core, respectively. When rotor windings and stator windings are not energized, a flux of the permanent magnets forms a closed magnetic circuit within the stator. When the rotor windings and the stator windings are energized, magnetic force lines of the electromagnets and permanent magnets flow through an armature core in the same direction via teeth and fluxes are increased.
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